Remote Command Execution

   Remote Command execution  :    

 Find out ip address of system  using

>start>run>type cmd>type ipconfig

// SERVER SIDE

 #include <arpa/inet.h>  /* for sockaddr_in and inet_ntoa() */
#include <stdlib.h>     /* for atoi() and exit() */
#include <string.h>     /* for memset() */

ServAddr.sin_addr.s_addr = htonl(INADDR_ANY); ;  /*this means that server will serve to the specific port which is mentioned regardless of what its ip address is*/

  you need to change  IP Address in client side only


CLIENT SIDE ADD:


 struct sockaddr_in ServAddr; /* server address */

char *servIP;                    /* Server IP address (dotted quad) */
    char *echoString;


 print("enter ip");
scanf("%s",servIP);  // use argv[1]
    memset(&echoServAddr, 0, sizeof(ServAddr));     /* Zero out structure */
    echoServAddr.sin_family      = AF_INET;             /* Internet address family */
    echoServAddr.sin_addr.s_addr = inet_addr(servIP);   /* Server IP address */
    echoServAddr.sin_port        = htons(ServPort); /* Server port */

if(connfd!=0)
    printf("Server accepted client \n");
else
    printf("Server not accepted client\n");


recv(connfd,buff,1024,0);
    printf("Serever received msg from client  %s",buff);

 system( buff );
close(sd);
    

//  CLIENT SIDE PROGRAM
#include<sys/types.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<string.h>
#include<stddef.h>



char ip_adr[15]="10.121.9.240";   // Here type ur server ipaddress
        struct sockaddr_in serv_addr;



    /*  gets(ip_adr);*/
        serv_addr.sin_addr.s_addr =inet_addr(ip_adr);           /* the obtained ip address which is a dotted string is converted to unsigned long.*/
        serv_addr.sin_family = AF_INET;          /* this information we specify that it belongs to tcp or udp*/

        serv_addr.sin_port = htons(port_no);      /*htons is used because we may need to change it to network byte order which is always big endian*/